BOSTON (CBS) – They may look like the real thing on sale at a deep discount, but buyer beware! Counterfeit Viagra and other pills could be deadly. As Chief Correspondent Joe Shortsleeve found out they are being purchased in huge numbers over the Internet.

Thousands of products might sound like Viagra but they are not. With names like Man-up…Weekend Prince and Maxman …they are flooding the market.

Federal Agent David Murphy says this stuff “is flying the under radar!”

WBZ-TV’s Joe Shortsleeve reports.

Investigators say nearly 80 different products claiming to be “all natural” are being shipped to this country from China and India. But they are not “all natural.” Most have been laced with the chemical found in prescription Viagra: Sildenafil.

Agent Murphy says these products “are putting people at risk.”

US Customs and Border Protection agents have been seizing them in big numbers. In four months, nearly 200,000 pills containing the active ingredient in Viagra have been seized in Chicago. And WBZ has learned there is also an investigation on going here in New England.

Now just last Friday Investigators at New York’s John F Kennedy airport seized 20,000 fake Viagra pills worth almost a quarter of million dollars on the street. The shipment came from Hong Kong and something did not look quite right.

If you have questions about a particular internet pharmacy you can contact the National Association of Boards of Pharmacy at www.nabp.net.